Weapons of the Gods uses a custom-designed ruleset called the "Wuxia Action System". The player rolls the number of specified dice equal to the character's skill. The player then looks for matching dice. For each match, the player multiplies the number of matches by ten and adds the value of the dice in the match. For example, a roll of five dice showing 3,3,6,8,0 is a 23 (or 18, 16, or 10, should the player want a lower result).

The Wuxia Action System is also notable for the concept of the River, a small stock of dice that can be saved from any sets of matches for later use; this models the aspect of wuxia stories in which a badly battered combatant can summon a hidden reserve of strength later in the battle, even when badly wounded.